Cylinder-grinding tool



P. L. STARR CYLINDER GRINDING TOOL April 12, 1927.

Filed Oct. 2 1923 2 sheets sheefi l,624,6 5 April 12, 1927. P. L. STARR 3 vCYLINDER GRINDING TOOL Filed Oct. 24, 1923 2 sheets-Sheet 2 INVENTOR wbw Patented Apr. 12, 1927.

UNITED STATES PERL LEE STARR, OF CHICAGO, ILLINOIS.

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' Application filed October 24,:1923. Serial 2N0. 670,441.

This invention relates to new and useful improvements in grinding tools and more particularly to grinding tools which are especially adapted for use in grinding motor 5 vehicle cylinders and other cylindrical surfaces of this type. The main object of my. invention is the provision of a cylinder grinding tool wherein the grinding elements are supported for adjustment so .that they may bereadily positioned "for contact with the inner surfaces of a motorfvehicle cylinder or other surfaces of this character.

Another object of my invention is the provision of a grinding tool wherein the grindingelements are mounted in such a manner as to be quickly and readily adjusted radially with respect to the support so that the grinding members during their revolution will describe circles-of various sizes so as to be readily fitted into motor vehicle cylinders of various size bores.

- A still further object of my invention is the provision of-a grinding tool, including separable sections carrying grinding elements' and including means wherebyt e tions may be urged apart upon an angle with respect toPeach other, and includes additional means for normally ur ing the grinding elements into contact wit the interior surface of a motor vehicle cylinder so that during the grinding away of the surface of the cylinder, the-grinding elements will continue to move away from each-"other upon an angle so as to carry out a varied grinding movement over the interior of the cylinder surface. a I V A still further object of my inventlon is the provision of a grinding tool wherein the grinding elements are so mounted with re 40 spect to each other that during their grinding operation they will. always describe a perfect circle; thus when applied for the purpose of grinding motor vehicle cylinders their grinding action will produce" a per-' fectly cylindrical bore. v a

'A still further object of my invention is the provision of a grinding tool, including supporting members for the grinding elements whereby said (grinding elements may be simultaneously a justed with respect to the supporting members so that the grinding elements will. at all times describe a perfept circle during the revolution of the supporting members.

A still further object of my invention is the provision of a grinding tool whereby the SEC- grinding elements are mounted upon a rotary support insuch a manner as to not only be adjusted simultaneously, but independently adjusted to compensate for the wear upon the various grinding elements in case one of said grinding elements should .have a tendency towear-away its grinding surface considerablyfaster than the remaining rinding elementswhereby all of the grin ng elements may be normally maintained in contact with the interior of the surface beingoperated upon'.

With the above and other objects in view the invention consists in the novel features of construction, the combination and arrangement of parts hereinafter more fully set' forth, pointed out in the claims and shown in the which: Fig. 1, is-a side elevation of a grinding tool constructed in accordance with my invention." a

F'g. 2, is a top plan view with portions i of the device removed therefrom.

Fig. 3,'is a side elevationof'the supporting member, the grinding elements being removed. g

Fig. 4, is a transverse sectional view taken on line 44 of Fig. 1. a

Fig. 5, is adetail sectional view taken on line 5-5 of Fig! 2.

Fig. 6, is-a side elevation of one of the grinding elements and its support.

v 'Fig. 7, is a transverse sectional view taken on line 77 of Fig. 1. Fig. 8, is av transverse section taken on.

line 8-8 of Fig 1.

9, is a detail 'top plan view.

Fig. -10, is a detail vertical sectional view through'the cap member, 'and r Fig. 1'1, is adetail sectional view of amodified "form, illustratin the manner of accompanying drawings in supporting the grinding e ements in an extended position.

In carrying out my invention 1 zirovidea sectional supporting member WhlCh in-' cludes the sections 1 and 2. These sections 1 and 2 have one end fittted into a cap 3 which is connected to the section'l by means of screws 4, although it will be apparent that any similar type oi fastening means may be used to form the connection between thecap 3 and the section 1. The cap 3 is attached to the driving shaft ,5 throu h the medium of a universal joint 6 where y the grinding tool-supported by the cap 3 ice may be readily positioned at various angles with respect to the driving shaft 5.

In view of the above, it will be noted that the section 1 is secured to the cap 3 against movement with respect to, the cap, but the section 2 is free for movement with res set to the cap and the section 1 and in or er to connect the two sections so thatthe sections may be readily moved at various angles with respect to each other, suitable connecting pins 7 and 8 are provided, the pins 7 extending transversely across the recessed portion 9, formed in the section 1 at one end. The pins 8 extend transversely across the recesslO, formed in one end of the section 2 as illustrated in Fig. 5. The pins 7 and 8 are disposed in a common plane at an oblique angle to the axis of the tool, and loosely mounted upon these pins are the disks 11 which are disposed upon the opposite sides of the recessed portions 9 and 10 to form a parallel ruler connection between the two sections whereby during the move ment of said sections it will have a tendency to move them away from each other or toward each other at an oblique angle. These two disks 11 are normally maintained in a frictional contact with the sections 1 and 2 by means of the coil spring 12 which is disposed between the disks wlth its ends fitting into central recesses 13 formed in the disks to prevent lateral movement on the part of the spring.

From this it will be apparent that the operation of the spring 12 will tend to normally maintain the disks 11 into tight engagement with the sections 1 and 2 to eliminate lateral play on the part of the sections with respect to each other.

The sections 1 and 2 are provided adjacent to the central portions thereof with transversely aligned openings in which the disks 11 are positioned, said disks being' loosely mounted upon the transverse pins 7 and 8 which are carriedby the sections 1 and 2, respectively and extend transversely through the openings 14 and through the disks 11, said pins being disposed upon opposite sides of the center of the disks and arranged in a plane at an angle with respect 7 to the axis of the tool or in the same position as described for pins 7 and 8 whereby the movement of said sections with respect to each other will be on an oblique line. The disks 11 are retained in frictional con tact with the side walls of opening 14: so as to securely eliminate any lateral playon the part of sections 1 and 2 by means of the coil" spring 12'. It will be apparent that disks 11 co operate with the disks 11 in eliminating the lateral movement of the sections.

The grinding elements 15 are supported by means of longitudinal bars 16 which are, concave or recessed as at 17 to receive the grinding elements 15. The grinding elements'15 are retained against movement within the recesses 17 through the medium of the set screws 18 which extend through one wall of the recesses and contact with one face of the grinding elements. The bars 16 which support, the grinding elements are each provided at one end with an arm 19 which extends at substantially right angles with respect to thebars 16 and is provided upon its inner face with a supporting web or bracket 20. The bars 16 are additionally provided with supporting arms 21 arranged in spaced relation with the arms 19 and preferably disposed at a point adjacent to the other end of the bar as clearly illustrated in. Fig. 6. These arms 21 are also provided with the supporting webs or brackets 20 which are disposed within the angle between the arms and thesupporting bars.

In order to mount the grinding element supports in their respective positions upon the supporting members, each of the sections' 1 and 2 is provided with spaced recessed portions 22, arranged in pairs at remote points on the outer faces of the sections. These recesses 22 are further provided with a central recessed portion 23, forming bearing shoulders 24 which are disposed upon opposite sides of the recesses 23.

recesses in each of the sections, while the arms 21 will be disposed in the uppermost recesses of the pair of recesses at one end of the section. Other of the supporting bars will have their positions reversed so that the supporting arms 19 will be fitted into the lowermost recesses with the arms 21 fitting into the lowermost recesses of the upper pair of recesses. This arrangement of fitting the arms of the bars 16 intothe recesses will bring all of the ends of the grinding elements 15 into the same hori zontal' plane. In fitting the arms 19 and 21 into the recesses formed in the sections 1 and 2, it will be apparent that the arms will ride over the spaced bearing shoulders 24 and the web or supporting brackets 20 will be fitted into the recessed portions 23. From this it will be apparent that the grinding elements maybe adjusted toward and away from the sections 1 and 2 by moving the arms 19 and 21 into and out of the recesses formed in the sections and "be supported in: their proper relative positions by having the arms contacting with the bearing shoulders 24.

means is provided for retaining the arms 19 and '21 invarious adjusted positions with j respect to the sections 1 and 2, said clamping means comprising V shaped bars 25 which are positioned between the bars 16 so-that the faces ofthe clamping bars 25 upon opposite sides of the apex thereof will engage the opposing supports for-the grinding elements. j

Attention is directed to thefact that the clamping bars 25 have a flat engaging contact with the sides of the bars 16 upon which the arms 19 and 21 are formed so that the engaging surfaces of the bars 25 will be broughtinto direct contact with the arms 19 and 21 so as to positively force them into a secure bearing engagement with the shoul- (lers 24; thus retainlng the bars 6 in various adjusted positions with respect to the sections upon which they are mounted. The apexes of the bars 25 are fitted into-V" shaped grooves 26 formed in the outer surfaces of the sections land 2, and in order to retain the clamping bars 25 in their operative positions, fastening screws 27 are provided which extend through the clamping bars 25 and engage with the body portions of the sections 1 and 2. From this arrangement it will be apparent that when it is desired to adjust the grinding elements 15,-

with respect to the sections 1 and 2, the fas-v tening screws 27 are loosenedso as to permit outward movement on the part of the clamp mg bars 25 which will release the support.- ing members of the grinding elements and permit them to. be adjusted readily with respect to the sections 1 and 2. As soonfas the supports for? the grinding elements are released through the medium of the clamping bars 25, they are urged outwardly by means of the springs 28, the ends of which engage with the inner faces of the bars 16, while the intermediate portions are wound upon suitable pins 29 which are fitted within the recesses 30 formed at spaced intervals within the bars 25, said pins extending transverse] across the recesses with th'e ends of the spring extending in opposite directions at each side of the recesses and projecting into the grooves 31 upon the inner faces of the bars 16 whereby to permit the bars 16 to be brought into direct contact with the exterior surface of the sections 1' and 2.

I Attention is directed to the fact that when the securing bars 25 are loosened through the medium of the screws 27, the tension of the ends of thesprings 28 will urge the grinding element supports in a radial direction away from sections 1 and 2 and the grinding elenfents may be readily adjusted in various positions through the movements of the securing bars 25. Itwill also be apparent that upon loosening the securing bars 25 the proper distance, the spring members 23 will urge all of the grinding elements 15 into direct contact with the inner surfaces of the cylinder and the contact of the grinding elements with the cylindrical wall of the cylinder willbrin-g the body-portion of the tool'in a central position with res ect'to the cylindrical wall of the cylinder w 'erebv all of the grinding elements will be maintained in direct contact with the wallsof the cylinder during the "grinding operation.

Attention is directed to the fact that one side of the cap member 3 is cut away to form an annular recess 32 toaccommodate the movement of, the section 2 with respect to the section 1 and arranged within this recess 32 is a suitable compressible packing 33 which will readily permit the section 2 to be adjusted within the recess 32, and at the same time plrevent any of the loosened particles from c grinding elements or wall of the cylinder from entering-the cap.

When the grining tool 15 positioned within 7 a. cylinder or other cylindrical article, the two sections 1 and 2 are brought tightly toe main tained in this'position in any s uitable manner while being inserted within the cylinder, and after being correctly positioned within the cylinder they may be released to permit the grinding elements 15 to come in gether as shown in Fig. 7 andgmay inder. In order to urge the sections 1 and 2 away from each other, suitable coil springs 34. are .provided, said coil springs having their ends fitted into opposing recesses,

direct contact with the inner wall of'the cyl- I formed in the inner faces of the sections 1 and 2 whereby-"upon releasing the sections the tensions of the springs 34 will urge the sections away from each other, and in view of the fact that these sections are connected the inner surface ofthe cylinder.

In all .of the cylinder grinding tools in use at the present time, as faras I know, the grinding elements are so arranged thatgrinding action upon the inner face of the cylinder is carried out in a horizontal plane, thus causing in a great many instances the grooving of the surface of a cylinder particu-' larly due to the type of grinding stones which are used, and it is the main object of my invention to provide a grinding tool which '13 will eliminate any grooving or unevenness inthe grinding movement so theta perfectl bdre of the cylinder is larger at the top smooth and even surface will be provide with the particular grinding action set forth above in the description of my tool.

I Wish to also direct, attention to the fact that the longitudinal grooves which are formed in the bars 16 are positioned at a slight angle with respect to the main portion of the bars whereby the grinding stones or elements may be interchanged and also reversed in accordance to their position within the grooves in the bars 16 to compensate for any unevenness of the stones during the grinding action, and from this construction it will be apparent that the major portion of the stories may be utilized for carrying-out the grinding action.-

In order to loosen the bars 16 from their wedging position between the grinding element supports, suitable coil springs are fitted into suitable recesses 36, formed at the bottom of the grooves 26 and have a tendency to urge the bars 25 outwardly when the screws 27 v are loosened.

The sections 1 and 2 are brought into close abutting relation as shown in Fig.8 and retained in this position through suitable means, carried by the cap 3 and connected to one otthe sections, said means also being utilized to impart movement tothe sections to move them at various angles to each other. inner end of which is provided with a collar 38 to embrace the pin 8 carried by the section 2 as clearly shown in F i 10. The

upper end of the rod 37 is threa ed as at 39 and extends into an opening 40 in the top of the cap The top of the cap 3 surrounding the opening 40 is formed with a seat 41 upon which is normally seated the oval shaped cap or nut 42, said nutha-ving a threaded bore 43 to receive the upper threaded end'of the rod 37 whereby turning movement of the nut 42 will impart movement to the rod for moving the sections 1 and 2 toward or away from each other. I

'The nut 42 is retained in a normally seated position by means of a retaining strap 44, the ends of which are secured to thecap "3 upon opposite sides of the nut42 and its intermediateportion provided with aconc'ave recess 45 to receive the u per por-' tion of the nut. From thisit wil be apparent that the nut 42 while being normally maintained upon its seat will be free to rotate to adjust the rod 37. To facilitate the turning of the nut, radially projecting points 46 are formed on the nut and the nut so positioned with respect to the cap 3 that the points may project beyond the side wall of the cap to be readily engaged for turning the nut. v

a lit is-usually the case in worn cylinders,

This means includes a rod 37, the

' operator engage their finger with the points 46 of the nut and import a slight turn to the nut which will impart a movement of the sections through the medium of the rod 37 the movement ofgthe sections away from each other throughout their length being assured by the coil springs 34. From this it will be apparent that the uneven wall of the bore of a cylinder may be ground 0d until it presents a true cylindrical surface throughout the len h of the cylinder; The nut 42 may be rea ily adjusted during the rotary movement of the tool as the points 46 of the nut extend beyond the side wall of the cap 3 so that they may be readily engaged by the finger of the operator to prop-i erly adjust the sections and the grinding elements carried thereby.

In Fig. 11 I have illustrated a slightly modified form of the invention wherein; provided suitable supporting members for the aims 19' and 21' so that the grinding elements 15' may be readily adjusted to the farthest extent and the arms 19 and 21' be -vided with spaced recesses to receive portions of theweb members 20' whereby the arms 19' and 21' will be brought into direct bearing contact with one face of the bars to support them in their proper relative positions with respect to the sections 1 and 2 In order to retain the bars 35 in contact with the outer surface of the sections 1 and 2' and with the arms 19' and 21', securing bolts 36 are extended through portions of the bars 35 and are provided with nuts 37 to clamp the bars 35' between the heads of the bolts and the nuts. In adjusting the bars 16 radially with respect to the sections 1 and 2', should they be adjusted outwardly to a certain distance, there will not be sufiicient bearing surface on the shoulders 24 to support the adjusted radially with respect to the sec-- winch are in needof regrinding, that the tions 1 and .2 so that they may be readily tee I the sections from each other withincidental tions toward and from each other, a capfittingone end of the sections, means for connecting one of the sections to the cap, abrading elements carried by and projecting outwardly beyond the sections, and means whereby the cap may be connected to a driving element for simultaneously rotatingthFsections without interfering with their relative movement.

2. A "nding tool comprising independent sections, means connecting the sections to compel a relatively axial movement thereof during any movement of the sections toward and from each other, and means to compel a relative movement of axial movement.

3.'A inding toolcomprising independ-' ent sections, means connecting the sections to compel a relatively axial movement therefor during any movement of the sections toward and from each other, said means including adjacent. pins ori the respective sections d sposed on a plane at an'angle to both the horizontal and vertical planes of the sections and rigid connectors engaging said pins, a cap to whichone of the sections is secured and-in which the other of said sec- I tions is mounted for relative movement,

' ent sections, means connecting the sections and a member connected to one of said pins and movable through the cap, the relative longitudinal movement of said member compelling a relative movement of the sections. v

4. A grinding tool comprising lndependto compel a relatively axial movement therefor during any movement of the sections toward and from each other, abrading element carrying bars removably seated 1n recesses formed in the-sections, and clamping bars adjustable relative to the sections and adapted to engage and hold ad'acent abrading element carrying bars in xed relatlon to the sections.

5. A inding tool comprising independent sections, means connecting the sections to compel a relatively axial movement therefor during any movement of the sections toward and from each other, abrading element carrying bars removably seated in recesses formed in the sections, clamping bars adjustable relative to the sections and adapted to engage and hold adjacent abrading element carrying bars in fixed relation to the sections, and springs carried by the clamping bars to engage and operate the element carrying bars when permitted by the adjustment of the clamping bars. 7

6. A grinding tool comprising independent semi-circular sections, connecting means between the sections comprising apin projecting from each section, the said pins being arranged in aplane at an oblique angle to the axis of the tool, a rigid connector loosely engaging said pins to thereby compel a relative axial movement of the sections during any tendency of the sections to move toward or from each other, a cap receiving the ends of the sections and connected to one while free of connection with the other, a rod connected to the pin projecting from the free section, said rod. extending through the cap and threaded, and a nut engaging the threaded end of the rod beyond the cap, whereby the sections may be set in a predetermined spaced relation at will.

7. A grinding tool comprising independent sections, means connecting thesections to compel a relatively axial movement therefor during any movement of the sections toward and from each other, the outer surface of each section being formed with a recess and with a reduced channel at each end of the recess, the recesses of one section being horizontally offset with the recesses of the other section, abrad'ing element carrying members having lateral bars to seat 1n said recesses and engage in the channels, the bars of the members being so disposed relative to the ends of the members that the members will be aligned horizontally of the sections, and a single means for clamping the members of any 'one'section in place.

8. A grinding tool comprising independent sections, means connecting the sections to compel a relatively axial movement therefor during any movement of. the sections toward and from each other, each of the sections being formed with recesses opening through the outer surface thereof, members adapted to be seated in said recesses, clampin bars adapted to -.bear against relatively adjacent surfaces of the members secured in the recesses of one section, means for securing the clamping bars to the sections to permit said bars to be adjusted relative to toward and from each other, each of the sections being formed with recesses opening through the outer surface, abrading element carrying members adapted to bear on Q mews the outer surface of the sectionsfsaia meinmembers to compel a, movement of the members having projecting portions to seat in bersfrom the section When permitted by said recesses, a clamping bar adjustable fela the adjustment of the clamping bar. 19

tive to each section and adapted'to engage In Witness whereof, I hereunto subscribe and hold a plurality of members in fixed my name this 22nd day of October A.- D., relation to the sections, and springs carried 1923.

by the clamping bars and underlying vsaid PERL LEE STARR. 

